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Co-Evolution of AR Gene Copy Number and Structural Complexity in Castration-Resistant Prostate Cancer
Co-Evolution of AR Gene Copy Number and Structural Complexity in Castration-Resistant Pros...
Co-Evolution of AR Gene Copy Number and Structural Complexity in Castration-Resistant Prostate Cancer

Detailed Information

자료유형  
 학위논문 서양
최종처리일시  
20260209102831
ISBN  
9798290916378
DDC  
615
저자명  
Zivanovic, Andrej.
서명/저자  
Co-Evolution of AR Gene Copy Number and Structural Complexity in Castration-Resistant Prostate Cancer
발행사항  
[Sl] : University of Minnesota, 2023
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2023
형태사항  
172 p
주기사항  
Source: Dissertations Abstracts International, Volume: 87-02, Section: B.
주기사항  
Includes supplementary digital materials.
주기사항  
Advisor: Dehm, Scott M.
학위논문주기  
Thesis (Ph.D.)--University of Minnesota, 2023.
초록/해제  
요약Prostate cancer is the second leading cause of cancer death in males. Management of metastatic prostate cancer involves the therapeutic targeting of the androgen receptor (AR). AR is vital for normal prostate development and homeostasis, and prostate cells remain dependent on continued AR signaling for growth and survival. While initially efficacious, AR-targeted therapies will eventually fail during the emergence of castration-resistant prostate cancer (CRPC). CRPC is the lethal from of prostate cancer, and represents a major clinical challenge to managing this disease. The majority of CRPC remains dependent on AR, demonstrating continued reliance on AR signaling. The AR gene undergoes alterations during chronic AR-targeted therapy as prostate cancer cells adapt to castrate conditions. These alterations include mutations, structural rearrangement and amplification of the AR gene, and are involved in reactivating AR signaling under castrate conditions. These AR alterations often co-occur in CRPC tumors, but it is unclear whether this reflects intra-tumor heterogeneity or clonality. The goals of the studies performed in this dissertation were to characterize complex AR alterations and their clonality, and investigate their functional implications in conferring a selective advantage during androgen deprivation. We analyzed 41 CRPC tumors and 6 patient-derived xenografts (PDXs) using linked-read DNA-sequencing. We discovered that 7 samples harbored complex, phased AR rearrangements that occurred in a high AR copy number context. The mechanism behind these complex alterations in AR was found to be AR extrachromosomal DNA. Additionally, we investigated the clonal dynamics of two patient-derived xenografts (PDX) models of prostate cancer, which we propagated under hormone-replete and hormone-depleted conditions in vivo and in vitro. We measured the clonal dynamics by assessing a tandem duplication with a breakpoint transecting the AR gene in LuCaP 77 PDXs and double minute chromosomes harboring the AR gene in the LuCaP 105CR PDXs. We found that both of these AR alterations were clonally stable in these PDX models under different hormonal conditions in vitro and in vivo. We describe two different mechanisms of AR amplification found in LuCaP 105CR and VCaP-EnzR cells that have emerged with chronic selection pressure from AR inhibition. Our findings show that certain AR alterations remain clonally stable during acute androgen depletion, while others display clonal evolution during chronic androgen depletion or pharmacological inhibition of AR.
일반주제명  
Pharmacology
일반주제명  
Oncology
일반주제명  
Genetics
키워드  
Androgen receptor
키워드  
Cancer biology
키워드  
Genomics
키워드  
Prostate cancer
키워드  
Therapy resistance
기타저자  
University of Minnesota Pharmacology
기본자료저록  
Dissertations Abstracts International. 87-02B.
전자적 위치 및 접속  
로그인 후 원문을 볼 수 있습니다.

MARC

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■040    ▼aMiAaPQ▼cMiAaPQ
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■1001  ▼aZivanovic,  Andrej.
■24510▼aCo-Evolution  of  AR  Gene  Copy  Number  and  Structural  Complexity  in  Castration-Resistant  Prostate  Cancer
■260    ▼a[Sl]▼bUniversity  of  Minnesota▼c2023
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2023
■300    ▼a172  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  87-02,  Section:  B.
■500    ▼aIncludes  supplementary  digital  materials.
■500    ▼aAdvisor:  Dehm,  Scott  M.
■5021  ▼aThesis  (Ph.D.)--University  of  Minnesota,  2023.
■520    ▼aProstate  cancer  is  the  second  leading  cause  of  cancer  death  in  males.  Management  of  metastatic  prostate  cancer  involves  the  therapeutic  targeting  of  the  androgen  receptor  (AR).  AR  is  vital  for  normal  prostate  development  and  homeostasis,  and  prostate  cells  remain  dependent  on  continued  AR  signaling  for  growth  and  survival.  While  initially  efficacious,  AR-targeted  therapies  will  eventually  fail  during  the  emergence  of  castration-resistant  prostate  cancer  (CRPC).  CRPC  is  the  lethal  from  of  prostate  cancer,  and  represents  a  major  clinical  challenge  to  managing  this  disease.  The  majority  of  CRPC  remains  dependent  on  AR,  demonstrating  continued  reliance  on  AR  signaling.  The  AR  gene  undergoes  alterations  during  chronic  AR-targeted  therapy  as  prostate  cancer  cells  adapt  to  castrate  conditions.  These  alterations  include  mutations,  structural  rearrangement  and  amplification  of  the  AR  gene,  and  are  involved  in  reactivating  AR  signaling  under  castrate  conditions.  These  AR  alterations  often  co-occur  in  CRPC  tumors,  but  it  is  unclear  whether  this  reflects  intra-tumor  heterogeneity  or  clonality.  The  goals  of  the  studies  performed  in  this  dissertation  were  to  characterize  complex  AR  alterations  and  their  clonality,  and  investigate  their  functional  implications  in  conferring  a  selective  advantage  during  androgen  deprivation.  We  analyzed  41  CRPC  tumors  and  6  patient-derived  xenografts  (PDXs)  using  linked-read  DNA-sequencing.  We  discovered  that  7  samples  harbored  complex,  phased  AR  rearrangements  that  occurred  in  a  high  AR  copy  number  context.  The  mechanism  behind  these  complex  alterations  in  AR  was found  to  be  AR  extrachromosomal  DNA.  Additionally,  we  investigated  the  clonal  dynamics  of  two  patient-derived  xenografts  (PDX)  models  of  prostate  cancer,  which  we  propagated  under  hormone-replete  and  hormone-depleted  conditions  in  vivo  and  in  vitro.  We  measured  the  clonal  dynamics  by  assessing  a  tandem  duplication  with  a  breakpoint  transecting  the  AR  gene  in  LuCaP  77  PDXs  and  double  minute  chromosomes  harboring  the  AR  gene  in  the  LuCaP  105CR  PDXs.  We  found  that  both  of  these  AR  alterations  were  clonally  stable  in  these  PDX  models  under  different  hormonal  conditions  in  vitro  and  in  vivo.  We  describe  two  different  mechanisms  of  AR  amplification  found  in  LuCaP  105CR  and  VCaP-EnzR  cells  that  have  emerged  with  chronic  selection  pressure  from  AR  inhibition.  Our  findings  show  that  certain  AR  alterations  remain  clonally  stable  during  acute  androgen  depletion,  while  others  display  clonal  evolution  during  chronic  androgen  depletion  or  pharmacological  inhibition  of  AR.
■590    ▼aSchool  code:  0130.
■650  4▼aPharmacology
■650  4▼aOncology
■650  4▼aGenetics
■653    ▼aAndrogen  receptor
■653    ▼aCancer  biology
■653    ▼aGenomics
■653    ▼aProstate  cancer
■653    ▼aTherapy  resistance
■690    ▼a0419
■690    ▼a0992
■690    ▼a0369
■71020▼aUniversity  of  Minnesota▼bPharmacology.
■7730  ▼tDissertations  Abstracts  International▼g87-02B.
■790    ▼a0130
■791    ▼aPh.D.
■792    ▼a2023
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17365826▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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